Worktable for lithoprinting



K. MURCK WORKTABLE FOR LITHOPRINTING- June 16, 1925.

Filed Dec. 9. 1924 Patented June 16, 1925.l

' XNUD MUacx, or NEW Yoan, \N. Assiettes', To" NEW' vonnissen PRINT'PABER Y colf, 1'1\T' ':;f,..4sL conrloaAlroN 'onNEW YORK.

rllhlis f ini/"entreng relates tothe art of? litho- 'f printing, and tl'ievobject of-Sthe invention is to provide an iinpr'oved'verkiandcooling table' for making litheprntsar- Lithoprintings carried on"l by' "pouring hotprepared gela-tineoniasuitable sten VVon \vl`i ieli='tl1e gelatine is allowed to 'eoel 'to forni a lm their-eem VVhen the 'gelati-ne is cold', it receives anfir'nprint fi'omlanioriglinal tracing or drawing Wliichistofbe duplicated.' The imprint is the-r'eafterx inked* and 'prints 'are thenmadfevfremthel gelatine, which forms al-negatlvefilin on the stencil Iii thelindiistry lithoprints must corn-pete withy blue;t prints and gother inexpensive Vprocess'esl'off duplica# tion, and it is thereferefessentifal#that' the lithop-rinting process bei v carried en' very rapidly tov lower the cost'of `p`if`d-uetifonA Hcretofore this has not been possible to any ,rreat extent because of the lack of a proper apparatus for carrying on the process of lithoprinting.

My invention provides a .Work and cooling table for lithoprinting so arranged that the entire process may be carried out very rapidly and conveniently and whereby the cost of production is materially lower and a practical apparatus is provided for the Workman. In the drawing illustrating my invention- Fig. 1 is a side view of a Work and cooling table for lithoprinting embodying my inf vention with parts removed and parts broken away.

Fig. 2 is an end view of the table.

Fig. 3 is a plan view.

The work table comprises an upper member 5 consisting of a slab of marble or suitable stone with a perfectly level and smooth printing surface 6. The slab 5 rests on a cooling coil consisting of the cooling pipes 7, 7 which are connected to and passed between the two headers 8 and 80. The pipes rest on a Wooden table 9.

The stone slab 5 and coil 7 .are very heavy and no special means are required to keep them in position on the wooden table. However, as the table is tilted vduring thework, suitable 'clamps 10 arev secured to the Wooden table to prevent xany slidinglmovement of the stonef or the pipes during the Work.

Theftable is mounted on a-suitablenumber of legs or supports 110, 10 which? carryvbearings 11, 11-in lWhich isqmounted avshaftlQQ rFhei table is.v supported and held to the shaft by' suitable clamps 131,113.

Ait Oneendthetable is provided With a f the header1I 8I to' the-adjacent stufiinig iboX 19 from which-another pipe QQleads `toa tank of ic'elwjvaterrQB-r kFror-nlth'e latterfthere Sis a leads from the pumpito the stufiingboxQO on ythe other end ofthe shaft 12. Still another-pipe 32 'leads fromtherstuliingboX 20 to: A'the header S0. It' will thus be :seen that When the pump is running, ice Water is being pumped from the tank 23, through `the headers and cooling pipes and back kkto the tank. As a consequence, the pipes are ice cold and cool the stone slab 5. y

To one side of the table there is provided a trough 27 which is supported on brackets 28, which slide in loops 29 under the Wooden table. The inner end of the brackets 28 form stops 30. 35 is a counter balancing Weightsecured to the brace 14:.

The operation is as follows The table is in normal Working position as shown in full lines in Figure 2 in which the table is level and locked by the latch 17 engaging the Vnotch 18. While the table is in this position hot gelatine is poured on'thestone slab 5 to cover as much thereof as may be required for a given size print'to be made. Or the table `may be tilted as shown in the dotted lines in Figure 2 and the gelatine poured on While the table is tilted. llVhile in the latter position the gelatine runs ofi' into the trough 27 which moves out from the table by ygravity, but because ofthe cooled stone slab, sufficient gelatine remains on the stone to form a thin film thereon', If the gelatine is poured on the stone While it is level, the stone is immediately thereafter tilted to cause the surplus gelatine to run off.

The table is then moved back to level po- `sition when the latch 17 automatically falls into the notch 18 to lock the table. And of course when the table is tilted the stop 16 limits the movement thereof to the position shown in the dotted lines in Figure 2. Thereafter the imprint is made as aforesaid and inked and from the gelatine negative thus formed on the stone, duplicate prints are made. Vhen the required number of prints have been made, the gelatine film is scraped oft' and the table is ready for the next operation.

Because of the'counterbalanced table the work in tilting and operating the table requires hardly any effort and the entire process is carried on very rapidly. rlhe pump is kept in constant operation so that the cold Water is constantly circulated through the pipes, insuring that the stone slab is at all times sufliciently cool to cause the hot gelatine to settle and form a film almost immediately after it is poured on the stone. It will further be understood that the pipes 21 and 32 are fitted into the stufling boxes 19 and 20 respectively, so as to turn with the table. Besides the convenience of the apparatus and the rapidity with which the Work may be carried on, it is a further advantage that the work may be done in a room at ordinary temperature for the convenience of the Workman. Heretofore, it has at times been necessary to carry the stone slab with the hot gelatine thereon into a separate cooling room to settle and then conveyed back to the worlroom. These changes in temperatures caused a great deal of inconvenience to the Workmen and loss of time in the operation.

While I have shown my invention in its preferred form, it will nevertheless be understood that changes and modifications may be made in the construction disclosed Without departing` from the spirit of the invention and the scope of the appended claims.

I claim z* l'. The combination of a stone table adapted to receive hot gelatine for the purpose set forth, means for tilting said stone table to cause the surplus gelatine to run off therefrom, a receptacle for said surplus gelatine automatically operable into receiving position when the said table is tilted, supporting means for said table and means for constantly cooling the said stone table to cause the gelatine to form a film thereon.

2. The combination of a balanced stone table adapted to receive het gelatine poured thereon for lithoprinting purposes, supporting means for said table, mechanism for pivoting said table on the said supporting means, on which said table is adapted to be tilted to cause the surplus gelatine to run off therefrom, a receptacle slidably supported on said table to receive the surplus gelatine therefrom, means for limiting the tilting movement ofthe table, means for locking the table in Working position, pipes placed beneath and in contact With said stone table and means for constantly circulating a cooling medium through the said pipes.

KNUD MURCK. 

